I really sympathise with the OP, these cars can be very frustrating and there are many times I've thought about throwing the towel in on Alfas. Coming from a 156 wagon, there are aspects I find astounding that Alfa haven't learned to put in place for newer models, but then there are things that I read about the Guilietta that make me angry with Alfa.
The trouble with my 159 is I've caused most of the issues, well they became apparent after remap etc, it ran perfectly well before that, but might not have continued to do so. It now runs very well, but there are a few more niggles to sort. There are a few noises with trim that I have a constant battle keeping on top of, I hate the way the suspension crashes around town, will be going some way to try and remedy this, but it won't involve losing the 19's and you can't have everything.
Bottom line with some of us though is that Alfas are a hobby, we secretly like having to fix things, some things that never needed fixing, wondering what to fix next and almost glad we don't have a perfect running, bland looking, bland cabin car on the drive.
I threw a roofbox on yesterday, cleaned the car in and out and just thought how cool can a car look with a roofbox on, side on with the TI rims complimenting the dashes of chrome you get from the light cluster. Then you get in and it looks so good, not overdone like so many cars, just subtle and ace. Then you drive from Herts up to Lancaster in crazy wind, almost constant rain, car gives me confidence like I've never felt in a car before (good tyres too), got caught in a couple of 50mph sections, but otherwise 80-90 and with crap weather, roofbox, fully loaded boot still returned 42mpg.
So I'll think about binning it at some point this week and the next week and so on, but end of day I love it. Bit like my marriage really
I also meant to say how my cabin never once steamed up on the wet journey with 3 others snoring away, great aircon system. Also, cars are pretty amazing when you think about how the engineers , clay model makers make everything fit so well. We should forgive them a few faults.